Darn Tough Boot Cushion Socks are a comfortable, fun choice for hiking socks. Shaft and mid-level underfoot cushioning provides just-right comfort during your hikes. Speaking of comfort, the wool blend is naturally antimicrobial, sweat-wicking, and fast-drying. And they come in a performance fit with True Seamless undetectable seam for smooth, stay-put wear. Merino wool/nylon/LYCRA spandex blend for all-season performance Moisture wicking and fast drying Naturally antimicrobial to repel bacteria and odor True Seamless undetectable seam fusiona |you simply won't feel it Fine-gauge knitting for durability without excess bulk Shaft and mid-level underfoot cushioning for comfort in boots Mid-calf height Performance fit won't slip or bunchSizing Details: Medium: Fits Men's shoe sizes 8-9.5 Large: Fits Men's shoe sizes 10-12 Extra-large: Fits Men's shoe sizes 12.5-14.5